Draft: am62x: increase heap growth limit
This is done to pass the CTS tests failed becauseof the following error:
java.lang.OutOfMemoryError: Failed to allocate a 1000016 byte allocation with 457176 free bytes and 446KB until OOM, target footprint 67108864, growth limit 67108864
CTS module : CtsLibcoreTestCases
Signed-off-by: souajih souajih@baylibre.com